diff --git a/src/classifier.c b/src/classifier.c
index c5f8e2f1..c077f61a 100644
--- a/src/classifier.c
+++ b/src/classifier.c
@@ -1288,4 +1288,6 @@ void run_classifier(int argc, char **argv)
     else if(0==strcmp(argv[2], "valid10")) validate_classifier_10(data, cfg, weights);
     else if(0==strcmp(argv[2], "validcrop")) validate_classifier_crop(data, cfg, weights);
     else if(0==strcmp(argv[2], "validfull")) validate_classifier_full(data, cfg, weights);
+
+    if (gpus && gpu_list && ngpus > 1) free(gpus);
 }
diff --git a/src/coco.c b/src/coco.c
index cdfd3dff..03dd3a61 100644
--- a/src/coco.c
+++ b/src/coco.c
@@ -226,6 +226,12 @@ void validate_coco(char *cfgfile, char *weightfile)
     fprintf(fp, "\n]\n");
     fclose(fp);
 
+    if (val) free(val);
+    if (val_resized) free(val_resized);
+    if (buf) free(buf);
+    if (buf_resized) free(buf_resized);
+    if (thr) free(thr);
+
     fprintf(stderr, "Total Detection Time: %f Seconds\n", (double)(time(0) - start));
 }
 
@@ -307,7 +313,9 @@ void validate_coco_recall(char *cfgfile, char *weightfile)
         }
 
         fprintf(stderr, "%5d %5d %5d\tRPs/Img: %.2f\tIOU: %.2f%%\tRecall:%.2f%%\n", i, correct, total, (float)proposals/(i+1), avg_iou*100/total, 100.*correct/total);
-        free(id);
+
+        if (fps) free(fps);
+        if (id) free(id);
         free_image(orig);
         free_image(sized);
     }
diff --git a/src/detector.c b/src/detector.c
index efe5571a..7f32c4fa 100644
--- a/src/detector.c
+++ b/src/detector.c
@@ -556,6 +556,7 @@ void validate_detector(char *datacfg, char *cfgfile, char *weightfile, char *out
     for (j = 0; j < classes; ++j) {
         if (fps) fclose(fps[j]);
     }
+    if (fps) free(fps);
     if (coco) {
 #ifdef WIN32
         fseek(fp, -3, SEEK_CUR);
@@ -563,8 +564,15 @@ void validate_detector(char *datacfg, char *cfgfile, char *weightfile, char *out
         fseek(fp, -2, SEEK_CUR);
 #endif
         fprintf(fp, "\n]\n");
-        fclose(fp);
     }
+    if (fp) fclose(fp);
+
+    if (val) free(val);
+    if (val_resized) free(val_resized);
+    if (thr) free(thr);
+    if (buf) free(buf);
+    if (buf_resized) free(buf_resized);
+
     fprintf(stderr, "Total Detection Time: %f Seconds\n", (double)time(0) - start);
 }
 
@@ -1099,6 +1107,11 @@ float validate_detector_map(char *datacfg, char *cfgfile, char *weightfile, floa
     else {
         free_network(net);
     }
+    if (val) free(val);
+    if (val_resized) free(val_resized);
+    if (thr) free(thr);
+    if (buf) free(buf);
+    if (buf_resized) free(buf_resized);
 
     return mean_average_precision;
 }
@@ -1505,4 +1518,6 @@ void run_detector(int argc, char **argv)
         free_list(options);
     }
     else printf(" There isn't such command: %s", argv[2]);
+
+    if (gpus && gpu_list && ngpus > 1) free(gpus);
 }
diff --git a/src/gemm.c b/src/gemm.c
index 9f5cb882..51f77cac 100644
--- a/src/gemm.c
+++ b/src/gemm.c
@@ -324,7 +324,7 @@ void transpose_32x32_bits_my(uint32_t *A, uint32_t *B, int lda, int ldb)
     unsigned int x, y;
     for (y = 0; y < 32; ++y) {
         for (x = 0; x < 32; ++x) {
-            if (A[y * lda] & (1 << x)) B[x * ldb] |= (uint32_t)1 << y;
+            if (A[y * lda] & ((uint32_t)1 << x)) B[x * ldb] |= (uint32_t)1 << y;
         }
     }
 }
@@ -636,48 +636,48 @@ void check_cpu_features(void) {
     //  Detect Features
     if (nIds >= 0x00000001) {
         cpuid(info, 0x00000001);
-        HW_MMX = (info[3] & ((int)1 << 23)) != 0;
-        HW_SSE = (info[3] & ((int)1 << 25)) != 0;
-        HW_SSE2 = (info[3] & ((int)1 << 26)) != 0;
-        HW_SSE3 = (info[2] & ((int)1 << 0)) != 0;
+        HW_MMX = (info[3] & ((uint32_t)1 << 23)) != 0;
+        HW_SSE = (info[3] & ((uint32_t)1 << 25)) != 0;
+        HW_SSE2 = (info[3] & ((uint32_t)1 << 26)) != 0;
+        HW_SSE3 = (info[2] & ((uint32_t)1 << 0)) != 0;
 
-        HW_SSSE3 = (info[2] & ((int)1 << 9)) != 0;
-        HW_SSE41 = (info[2] & ((int)1 << 19)) != 0;
-        HW_SSE42 = (info[2] & ((int)1 << 20)) != 0;
-        HW_AES = (info[2] & ((int)1 << 25)) != 0;
+        HW_SSSE3 = (info[2] & ((uint32_t)1 << 9)) != 0;
+        HW_SSE41 = (info[2] & ((uint32_t)1 << 19)) != 0;
+        HW_SSE42 = (info[2] & ((uint32_t)1 << 20)) != 0;
+        HW_AES = (info[2] & ((uint32_t)1 << 25)) != 0;
 
-        HW_AVX = (info[2] & ((int)1 << 28)) != 0;
-        HW_FMA3 = (info[2] & ((int)1 << 12)) != 0;
+        HW_AVX = (info[2] & ((uint32_t)1 << 28)) != 0;
+        HW_FMA3 = (info[2] & ((uint32_t)1 << 12)) != 0;
 
-        HW_RDRAND = (info[2] & ((int)1 << 30)) != 0;
+        HW_RDRAND = (info[2] & ((uint32_t)1 << 30)) != 0;
     }
     if (nIds >= 0x00000007) {
         cpuid(info, 0x00000007);
-        HW_AVX2 = (info[1] & ((int)1 << 5)) != 0;
+        HW_AVX2 = (info[1] & ((uint32_t)1 << 5)) != 0;
 
-        HW_BMI1 = (info[1] & ((int)1 << 3)) != 0;
-        HW_BMI2 = (info[1] & ((int)1 << 8)) != 0;
-        HW_ADX = (info[1] & ((int)1 << 19)) != 0;
-        HW_SHA = (info[1] & ((int)1 << 29)) != 0;
-        HW_PREFETCHWT1 = (info[2] & ((int)1 << 0)) != 0;
+        HW_BMI1 = (info[1] & ((uint32_t)1 << 3)) != 0;
+        HW_BMI2 = (info[1] & ((uint32_t)1 << 8)) != 0;
+        HW_ADX = (info[1] & ((uint32_t)1 << 19)) != 0;
+        HW_SHA = (info[1] & ((uint32_t)1 << 29)) != 0;
+        HW_PREFETCHWT1 = (info[2] & ((uint32_t)1 << 0)) != 0;
 
-        HW_AVX512F = (info[1] & ((int)1 << 16)) != 0;
-        HW_AVX512CD = (info[1] & ((int)1 << 28)) != 0;
-        HW_AVX512PF = (info[1] & ((int)1 << 26)) != 0;
-        HW_AVX512ER = (info[1] & ((int)1 << 27)) != 0;
-        HW_AVX512VL = (info[1] & ((int)1 << 31)) != 0;
-        HW_AVX512BW = (info[1] & ((int)1 << 30)) != 0;
-        HW_AVX512DQ = (info[1] & ((int)1 << 17)) != 0;
-        HW_AVX512IFMA = (info[1] & ((int)1 << 21)) != 0;
-        HW_AVX512VBMI = (info[2] & ((int)1 << 1)) != 0;
+        HW_AVX512F = (info[1] & ((uint32_t)1 << 16)) != 0;
+        HW_AVX512CD = (info[1] & ((uint32_t)1 << 28)) != 0;
+        HW_AVX512PF = (info[1] & ((uint32_t)1 << 26)) != 0;
+        HW_AVX512ER = (info[1] & ((uint32_t)1 << 27)) != 0;
+        HW_AVX512VL = (info[1] & ((uint32_t)1 << 31)) != 0;
+        HW_AVX512BW = (info[1] & ((uint32_t)1 << 30)) != 0;
+        HW_AVX512DQ = (info[1] & ((uint32_t)1 << 17)) != 0;
+        HW_AVX512IFMA = (info[1] & ((uint32_t)1 << 21)) != 0;
+        HW_AVX512VBMI = (info[2] & ((uint32_t)1 << 1)) != 0;
     }
     if (nExIds >= 0x80000001) {
         cpuid(info, 0x80000001);
-        HW_x64 = (info[3] & ((int)1 << 29)) != 0;
-        HW_ABM = (info[2] & ((int)1 << 5)) != 0;
-        HW_SSE4a = (info[2] & ((int)1 << 6)) != 0;
-        HW_FMA4 = (info[2] & ((int)1 << 16)) != 0;
-        HW_XOP = (info[2] & ((int)1 << 11)) != 0;
+        HW_x64 = (info[3] & ((uint32_t)1 << 29)) != 0;
+        HW_ABM = (info[2] & ((uint32_t)1 << 5)) != 0;
+        HW_SSE4a = (info[2] & ((uint32_t)1 << 6)) != 0;
+        HW_FMA4 = (info[2] & ((uint32_t)1 << 16)) != 0;
+        HW_XOP = (info[2] & ((uint32_t)1 << 11)) != 0;
     }
 }
 
diff --git a/src/go.c b/src/go.c
index 5d507768..88da6c0d 100644
--- a/src/go.c
+++ b/src/go.c
@@ -47,6 +47,7 @@ moves load_go_moves(char *filename)
     printf("%d\n", count);
     m.n = count;
     m.data = (char**)realloc(m.data, count * sizeof(char*));
+    fclose(fp);
     return m;
 }
 
diff --git a/src/image_opencv.cpp b/src/image_opencv.cpp
index 6951fb9a..0a8ccd98 100644
--- a/src/image_opencv.cpp
+++ b/src/image_opencv.cpp
@@ -703,11 +703,12 @@ int set_capture_position_frame_cv(cap_cv *cap, int index)
 
 image get_image_from_stream_cpp(cap_cv *cap)
 {
-    cv::Mat *src = new cv::Mat();
+    cv::Mat *src = NULL;
     static int once = 1;
     if (once) {
         once = 0;
         do {
+            if (src) delete src;
             src = get_capture_frame_cv(cap);
             if (!src) return make_empty_image(0, 0, 0);
         } while (src->cols < 1 || src->rows < 1 || src->channels() < 1);
@@ -719,6 +720,7 @@ image get_image_from_stream_cpp(cap_cv *cap)
     if (!src) return make_empty_image(0, 0, 0);
     image im = mat_to_image(*src);
     rgbgr_image(im);
+    if (src) delete src;
     return im;
 }
 // ----------------------------------------
diff --git a/src/network.c b/src/network.c
index c2249a54..15c9a9bc 100644
--- a/src/network.c
+++ b/src/network.c
@@ -809,6 +809,7 @@ char *detection_to_json(detection *dets, int nboxes, int classes, char **names,
     const float thresh = 0.005; // function get_network_boxes() has already filtred dets by actual threshold
 
     char *send_buf = (char *)calloc(1024, sizeof(char));
+    if (!send_buf) return 0;
     if (filename) {
         sprintf(send_buf, "{\n \"frame_id\":%lld, \n \"filename\":\"%s\", \n \"objects\": [ \n", frame_id, filename);
     }
@@ -826,6 +827,7 @@ char *detection_to_json(detection *dets, int nboxes, int classes, char **names,
                 if (class_id != -1) strcat(send_buf, ", \n");
                 class_id = j;
                 char *buf = (char *)calloc(2048, sizeof(char));
+                if (!buf) return 0;
                 //sprintf(buf, "{\"image_id\":%d, \"category_id\":%d, \"bbox\":[%f, %f, %f, %f], \"score\":%f}",
                 //    image_id, j, dets[i].bbox.x, dets[i].bbox.y, dets[i].bbox.w, dets[i].bbox.h, dets[i].prob[j]);
 
@@ -836,7 +838,10 @@ char *detection_to_json(detection *dets, int nboxes, int classes, char **names,
                 int buf_len = strlen(buf);
                 int total_len = send_buf_len + buf_len + 100;
                 send_buf = (char *)realloc(send_buf, total_len * sizeof(char));
-                if (!send_buf) return 0;// exit(-1);
+                if (!send_buf) {
+                    if (buf) free(buf);
+                    return 0;// exit(-1);
+                }
                 strcat(send_buf, buf);
                 free(buf);
             }
diff --git a/src/utils.c b/src/utils.c
index bee427ed..f18769ce 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -41,6 +41,7 @@ int *read_map(char *filename)
         map = (int*)realloc(map, n * sizeof(int));
         map[n-1] = atoi(str);
     }
+    if (file) fclose(file);
     return map;
 }
 
@@ -65,6 +66,7 @@ void shuffle(void *arr, size_t n, size_t size)
         memcpy((char*)arr+(j*size), (char*)arr+(i*size), size);
         memcpy((char*)arr+(i*size), swp,          size);
     }
+    free(swp);
 }
 
 void del_arg(int argc, char **argv, int index)
@@ -685,9 +687,9 @@ int max_index(float *a, int n)
 
 int top_max_index(float *a, int n, int k)
 {
+    if (n <= 0) return -1;
     float *values = (float*)calloc(k, sizeof(float));
     int *indexes = (int*)calloc(k, sizeof(int));
-    if (n <= 0) return -1;
     int i, j;
     for (i = 0; i < n; ++i) {
         for (j = 0; j < k; ++j) {
diff --git a/src/yolo.c b/src/yolo.c
index 711470ea..339d49cd 100644
--- a/src/yolo.c
+++ b/src/yolo.c
@@ -189,6 +189,14 @@ void validate_yolo(char *cfgfile, char *weightfile)
             free_image(val_resized[t]);
         }
     }
+
+    if (fps) free(fps);
+    if (val) free(val);
+    if (val_resized) free(val_resized);
+    if (buf) free(buf);
+    if (buf_resized) free(buf_resized);
+    if (thr) free(thr);
+
     fprintf(stderr, "Total Detection Time: %f Seconds\n", (double)(time(0) - start));
 }